mettle
definition
the ability to cope well with difficulties or to face challenges in a spirited and resilient manner
example
Despite the numerous challenges they faced during the expedition, their mettle was evident as they navigated through the stormy weather with determination.
synonyms
resolvecouragefortitude
word origin — Middle English 'mettel', from the Old French 'mettel' meaning 'metal', which metaphorically referred to the strength or quality of a person.